// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.apache.impala.calcite.schema;

import com.google.common.collect.ImmutableMap;
import org.apache.calcite.prepare.CalciteCatalogReader;
import org.apache.calcite.schema.Table;
import org.apache.calcite.schema.impl.AbstractSchema;
import org.apache.impala.catalog.FeTable;

import java.util.HashMap;
import java.util.Map;

public class CalciteDb extends AbstractSchema {

  private final Map<String, Table> tableMap_;

  private CalciteDb(Map<String, Table> tableMap) {
    this.tableMap_ = tableMap;
  }

  @Override
  protected Map<String, Table> getTableMap() {
    return tableMap_;
  }

  public static class Builder {
    private CalciteCatalogReader reader_;

    private final Map<String, Table> tableMap_ = new HashMap<>();

    public Builder(CalciteCatalogReader reader) {
      this.reader_ = reader;
    }

    public Builder addTable(String tableName, FeTable table) {
      if (!tableMap_.containsKey(tableName)) {
        tableMap_.put(tableName.toLowerCase(), new CalciteTable(table, reader_));
      }
      return this;
    }

    public CalciteDb build() {
      return new CalciteDb(ImmutableMap.copyOf(tableMap_));
    }
  }
}
